php分页加搜索

<?php
/**
 * Created by PhpStorm.
 * User: Danz
 * Date: 2017/3/28
 * Time: 9:46
 */
include_once "conn.php";//引入数据连接

//拼接SQL语句
$wherelist=array();
$urlist=array();
if(!empty($_GET['selecttype'])&&$_GET["selecttype"]!="0")
{
    $wherelist[]="menu_message.typeid=".$_GET['selecttype'];
    $urllist[]="selecttype=".$_GET['selecttype'];

}
if(!empty($_GET['search']))
{
    $wherelist[]=" name like '%".$_GET['search']."%'";
    $urllist[]="search=".$_GET['search'];
}

$where="";
if(count($wherelist)>0)
{
    $where=' and '.implode(' and ',$wherelist);
    $url='&'.implode('&',$urllist);
}

//分页的实现原理
    //1.获取数据表中总记录数
    $sql="select * from menu_message,menu_type where menu_message.typeid=menu_type.id $where ";

    $result=mysql_query($sql);
    $totalnum=mysql_num_rows($result);
    //每页显示条数
    $pagesize=2;
    //总共有几页
    $maxpage=ceil($totalnum/$pagesize);
    $page=isset($_GET['page'])?$_GET['page']:1;
//page小于1的时候等于1
    if($page <=1)
    {
        $page=1;
    }
//page大于最大页码时变成maxpage
    if($page>$maxpage)
    {
        $page=$maxpage;
    }

    //分页按钮
    $strli="";

    for($n=1;$n<=$maxpage;$n++){
        $strli.="<li><a href=\"index2.php?page=".$n.$url."\">$n</a></li>";
    }
//拼接查询语句
    $limit=" limit ".($page-1)*$pagesize.",$pagesize";
    $sql1="select *,menu_message.id as mid from menu_type,menu_message where menu_message.typeid=menu_type.id {$where}{$limit}";
    //$sql1="select * from news {$where} {$limit}";
    $res=mysql_query($sql1);


$str = "";
$str1="";

//输出分类选项

$resoption=mysql_query("SELECT * FROM `menu_type`");
while($rowoption=mysql_fetch_assoc($resoption)){
    $str1.="<option value=\"".$rowoption['id']."\">".$rowoption['type']."</option>";
}

//输出数据
while($row = mysql_fetch_assoc($res)){
    $str.="<tr>
                <td>".$row['mid']."</td>
                <td>".$row['type']."</td>
                <td><img src=\"img/" . $row['pic'] . "\" class=\"img-responsive\" alt=\"Responsive image\"></td>
                <td>".$row['name']."</td>
                <td>".$row['price']."</td>
                <td>".$row['discribe']."</td>
                <td><a href=\"action.php?t=editmenu&mid=".$row['mid']."\">修改</a></td>
                <td><a href=\"action.php?t=delmenu&mid=".$row['mid']."\">删除</a></td>
            </tr>";
}


?>
<link rel="stylesheet" href="css/bootstrap.css">
<style>
    img{
        width: 300px;
    }
    .pagination{
        margin:20px 35%;
    }
    .search-select{
        height:34px;
        border-left: 0;
        border-right: 0;
        border-radius: 0;
    }
    .input-group-addon{
        background-color: #fff;
    }

</style>
<a href="addmenu.php" class="btn btn-block btn-primary">添加食品</a>

<form action="index2.php" method="get" name="searchtype">
    <div class="input-group">
        <input type="text" class="form-control" placeholder="Search for..." name="search">
        <div class="input-group-btn">
            <select class="btn btn-default search-select" name="selecttype" >
                <option value="0">请选择</option>
                <?php echo $str1;?>
                <span class="caret"></span>
            </select>
        </div><!-- /btn-group -->
        <span class="input-group-btn">
            <input type="submit" class="btn btn-default">搜索</input>
        </span>
    </div>
</form>

<script>
    //    function change(){
    //        document.searchtype.submit();
    //    }
</script>
<!-- /input-group -->
<table class="table table-hover">
    <thead>
    <tr>
        <td>id</td>
        <td>类型</td>
        <td>图片</td>
        <td>名称</td>
        <td>价格</td>
        <td>描述</td>
        <td>修改</td>
        <td>删除</td>
    </tr>
    </thead>
    <tbody>
    <?php echo $str ?>
    </tbody>
</table>

<nav aria-label="Page navigation">
    <ul class="pagination pagination-lg">
        <li>
            <a href="index2.php?page=<?php echo ($page-1).$url;?>" aria-label="Previous">
                <span aria-hidden="true">&laquo;</span>
            </a>
        </li>
            <?php echo $strli;?>
        <li>
            <a href="index2.php?page=<?php echo ($page+1).$url;?>" aria-label="Next">
                <span aria-hidden="true">&raquo;</span>
            </a>
        </li>
    </ul>
</nav>